The Umayyads under the governor of Khurasan , Asad ibn Abdallah al-Qasri , had invaded Attack the principality of Khuttal in Transoxiana , and the local ruler Control called Request upon the Türgesh for aid Assistance .

An outnumbered force led by the Umayyad general al-Jarrah ibn Abdallah engaged Participation the Khazars for three days .